My Rambo and Onyx issues and fixes

[pippin88]

Hi guys,

I've been assembling my Rostock Max for the past week or two.

I originally bought the BYOLaser kit back in May.
I had a K40 small Chinese laser - I didn't realise until after the kit shipped that my laser was much too small to cut the parts. The Rostock is a big printer.
So I then decided to rebuild my laser with a new frame to increase cutting area from 300x200mm to 1200x800mm. I'm most of the way through that, but geez, some 3D printed parts would come in handy! So I ended up buying the laser cut parts from SeeMeCNC anyway. Glad I did as the quality is great. Only problem is I got shipped the EZstruder top mount stuff when I have a Steve's extruder, but I'll rig something up.

So late last night I got the wiring all finished and fired her up. Movement straight away!
But then in repetier host commands are queuing up and not doing anything. Thus begins my Rambo issue I do some reading and find I'm on the old Marlin firmware and repetier is meant to be much better.
So I watch SeeMeCNC's video and grab all the right files. Flash the firmware and get "avrdude: ser_send(): write error: sorry no info avail"
Now Rambo ain't working. And uploading in Arduino IDE isn't working either! - timing out or giving various errors "S&*T I've just destroyed my lovely Rambo, but I followed all instructions to a T" I says.
More googling and come across the issue of some boards having a defective bootloader. So I read up on AVR programming etc. It's now 3am and I am very unhappy!
Then on a fairly unrelated arduino thread I find a guy having a "avrdude: ser_send(): write error: sorry no info avail" problem that resolved with different USB ports.
So I unplug the printer from my trusty monitor USB hub and directly in to the back of my PC. And it F&*&(*&#%(&#king works. That was 3 hours I didn't need to waste and stress through, but hey it works!

Sweet, things are going great the next day. PID tune the hot end, great. Put in the command to PID tune the Onyx heated bed and hit enter - printer dies. All power lost. Works fine when turned on again. Happens reliably as soon as I try to heat the bed, either via the repetier button or GCode. Hmmm now I have an Onyx issue... Check all connections - good. Resistance 1.3ohm, which I believe is correct.
Lots more reading. Maybe the PSU is inadequate, but surely they can't be shipping a PSU that just can't cope at all!
I'd followed the assembly guide and put 4 wires for the heated bed from PSU to Rambo and used 14G wire from Rambo to bed. I'd used 4 wires all from the Molex connectors.
So I took a shot in the dark and swapped two of the heated bed wires for the other power wires to Rambo and it works.
I don't know how many rails / circuits this PSU has and whether that has some bearing?

So lessons learnt:
Use main USB ports
Try different wiring combinations.

I hope that helps someone else not spend hours of stress with these same issues.

[pippin88]

Gah Onyx issue continues.

It ran a PID tune cycle fine.
Values:
Kp 836.4233333333333
Ki 278.4733333333333
Kd 629.36

I put them in the EEPROM in Repetier host and now it's doing the same thing where PSU cuts out as soon as onyx is turned on!
Help!

[Flateric]

Unless I am just tired or something, those values look totally insane to me. I swear mine are like 82, .46 and 23 or something, Yours are so high!?

[pippin88]

I thought the numbers look large, but this is my first foray into 3D printing.

Those numbers are definitely what auto-tune gave me.

I've reset them to default values (15, 0.9, 40)

Turning on heated bed still trips PSU

[pippin88]

I think it is something to do with load on PSU / different rails.

The PSU seems to stay on more often if I also have the hot end on when I turn on the onyx.

So:
Hot end doesn't cause any problems
Onyx alone trips PSU
Hot end for a few seconds then onyx stays on for a while then cuts out.

[pippin88]

I've just tried putting a load on the 5v rail as some ATX power supplies need this to regulate 12v properly.
Two hard drives (label says 0.8A 5V) connected - PSU still cuts out frequently with heated bed.

I hooked up a separate old PSU to the heated bed power (to Rambo) and that seemed to work fine.
Just seems to be the kit PSU can't handle the load?

[pippin88]

First print!
I've rigged up a second power supply for the heated bed. Working fine with this.

First couple of prints didn't stick to glass - added kapton tape and working well.

Crappy photo of the print on the bed
[img]http://images.imagineant.com/d/211542-1 ... 203801.jpg[/img]

View of bottom - had difficulty getting photo. Glassy surface but with clear filament lines
[img]http://images.imagineant.com/d/211552-1/NJW_4748.jpg[/img]

Top - infill not quite to edges
[img]http://images.imagineant.com/d/211546-1/NJW_4745.jpg[/img]

Side - first few bits of bridging didn't work but without any changes next layers were ok.
[img]http://images.imagineant.com/d/211549-1/NJW_4746.jpg[/img]

[grimmindustries]

How did you wire the new power supply to the heated bed. I bought one but am a little worried that I won't wire it correctly.

First print!
I've rigged up a second power supply for the heated bed. Working fine with this.

First couple of prints didn't stick to glass - added kapton tape and working well.

Crappy photo of the print on the bed
[img]http://images.imagineant.com/d/211542-1 ... 203801.jpg[/img]

View of bottom - had difficulty getting photo. Glassy surface but with clear filament lines
[img]http://images.imagineant.com/d/211552-1/NJW_4748.jpg[/img]

Top - infill not quite to edges
[img]http://images.imagineant.com/d/211546-1/NJW_4745.jpg[/img]

Side - first few bits of bridging didn't work but without any changes next layers were ok.
[img]http://images.imagineant.com/d/211549-1/NJW_4746.jpg[/img]

[Jimustanguitar]

Sorry to hijack your thread, but tell us more about your DIY laser table. I'm building one right now and I've got just about everything that I need except time

Maybe start a new thread about it so we can talk
[img]http://mybroadband.co.za/vb/attachment. ... 1379424513[/img]

[mycroft]

Are there instructions anywhere for wiring the onyx rev 3?

[geneb]

coming soon!

I just got it yesterday and I'll be doing the write up for it tomorrow.

If you stare at it long enough, it's obvious what is going on, but you have to be familiar with how boards are laid out.

g.